My favorite base/ring combination for R700s for hunting is the Burris or Leupold Dual Dovetail set up. It's as solid as a rock. But on varmint rifles I usually wind up putting on Weaver bases and using Burris Signature Zee Rings since the recoil of a varmint rifle for me is vey minimal. The Mueller is a large scope so I think you'll likley want to use high rings on it. As best as I can recall that's what I used on the one I reviewed.
